ES1371 Datasheet, PDF (20/37 Pages) List of Unclassifed Manufacturers – ENSONIQ AudioPCI 97 digital controller

ENSONIQ Proprietary Information
7.4. Sample Rate Converter
This block receives or sends samples from/to the serial interface block for the playback/record channels. It
also provides the necessary sample rate conversion for the AC97 CODEC. The Sample Rate Converter
block contains one 32 bit register. This register is used to read/write the Sample Rate Converter
FIFO/Control RAM.
Sample Rate Converter Interface Register
Address 10H
Addressable as longword
Power on reset value 00000000H
Direct Mapped
Bit(s) R/W Name
Function
31:25 R/W SRC_RAM_ADR These bits are the address of the Sample Rate Converter RAM
location to be accessed.
24
R/W SRC_RAM_WE This bit is the read/write control bit for accessing the Sample Rate
Converter RAM.
23
R SRC_RAM_BUSY This bit when high indicates the Sample Rate Converter is accessing
the RAM. This bit will be set within 3 PCI clocks after accessing
this register. This bit will be Reset when the requested
read/write RAM operation has been completed.
22
R/W SRC_DISABLE This is the enable bit for the Sample Rate Converter.
0 - Sample Rate Converter enabled.
1 - Sample Rate Converter disabled.
21
R/W DIS_P1
This bit when high will disable Playback channel 1 from updating
the accumulator.
0 - Playback channel 1 accumulator update enabled.
1 - Playback channel 1 accumulator update disabled.
20
R/W DIS_P2
This bit when high will disable Playback channel 2 from updating
the accumulator.
0 - Playback channel 2 accumulator update enabled.
1 - Playback channel 2 accumulator update disabled.
19
R/W DIS_REC
This bit when high will disable Record channel from updating the
accumulator.
0 - Record channel accumulator update enabled.
1 - Record channel accumulator update disabled.
18:16 R/W UNDEFINED
These bits are undefined.
15:0 R/W SRC_RAM_DATA These bits are the value of the RAM to be read/written from /to the
RAM at the location pointed to by the SRC_RAM_ADR address
pointer above.
ENSONIQ Proprietary Information
ENSONIQ AudioPCI 97 Specification Rev 1.1 Oct 1, 1997
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